Present Perfect:
Exersises:
https://www.englisch-hilfen.de/en/exercises/tenses/present_perfect_negation.htm
https://www.englisch-hilfen.de/en/exercises/tenses/present_perfect_mix.htm
Past Perfect:
Exersises:
https://www.englisch-hilfen.de/en/exercises/tenses/past_perfect_negation.htm
https://www.englisch-hilfen.de/en/exercises/tenses/past_perfect.htm
Future Perfect:
Exersises:
https://www.englisch-hilfen.de/en/exercises/tenses/future_perfect_statements.htm
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